/
main.go
75 lines (62 loc) · 1.92 KB
/
main.go
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// Copyright 2017 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"flag"
"io/ioutil"
"log"
"os"
"plugin"
)
var (
entryPoint string
eventType string
pluginPath string
)
func main() {
flag.StringVar(&entryPoint, "entry-point", "F", "the name of a Go function that will be executed when the Cloud Function is triggered.")
flag.StringVar(&eventType, "event-type", "", "The Cloud Function event type. (bucket, http, or topic)")
flag.StringVar(&pluginPath, "plugin-path", "functions.so", "The path to the Go plugin that exports the function to be executed.")
flag.Parse()
if eventType == "" {
log.Fatal("Event type required; set using the --event-type flag.")
}
p, err := plugin.Open(pluginPath)
if err != nil {
log.Fatalf("unable to load the Go plugin: %s", err)
}
f, err := p.Lookup(entryPoint)
if err != nil {
log.Fatalf("unable to load the entrypoint function: %s", err)
}
stdin, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatalf("unable to load the event: %s", err)
}
var message string
switch eventType {
case "bucket":
message, err = objectChangeHandler(f, stdin)
case "http":
message, err = httpHandler(f, stdin)
case "topic":
message, err = topicPublishHandler(f, stdin)
default:
log.Fatalf("invalid event type: %s", eventType)
}
if err != nil {
log.Fatal(err)
}
if message != "" {
os.Stdout.WriteString(message)
}
os.Exit(0)
}